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nickgammon / G-Pascal

Tiny Pascal and Assembler for the Ben Eater's 6502 board
MIT License
27 stars 4 forks source link

6502 compatibility #3

Closed f4goh closed 6 months ago

f4goh commented 6 months ago

Hello, Is software compatible with classic MOS 6502 used in an Oric or i need absolutly WD65C02 ?

nickgammon commented 6 months ago

I saved a bit of effort by using the WD65C02 instruction set. That was what was on Ben Eater's board. You could modify it by replacing instructions that weren't on the WD65C02 set by their (lengthier) equivalents.

See https://en.wikipedia.org/wiki/WDC_65C02

For example, PHX,PLX,PHY,PLY.

You would have to replace those by transferring the register in question to A and then pushing it. And you would have to preserve A while you did that. So it is more tedious, but anything's possible!

f4goh commented 6 months ago

ok thanks.